LP#1129318: fix exception thrown when printing circ receipts

Because of a misplaced parenthesis in the patch introducing the
PATRON_EXPIRE_DATE_YMD receipt macro, attempting to print
various circ receipts would result in the following exception:

Error in util.date.formatted_date:
location.href = oils://remote/xul/2.3_5/server/circ/checkin.xul
typeof orig_date = string orig_date = 2014-11-07T00:00:00-0500
typeof _date = object _date = Fri Nov 07 2014 00:00:00 GMT-0500 (Eastern Standard Time)
format = undefined
TypeError: s is undefined

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Ben Shum <bshum@biblio.org>